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Figure 5 Projection of the structure of the hemihydrate phase along the c axis. In the topotactic dehydration hypothesis, this c axis has to be divided by two (Z = 8 → 4). The two curved arrows relate two tetra­amine-carbonato-cobalt and two nitrate groups which are separated by ∼1/2c and should translate in inverse direction along a in order to attain their superposition in projection onto the ab plane and also should finally rotate, making both Figs. 5 and 4 identical at the end of the dehydration process. Water mol­ecules are indicated by 'Ow'.

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